fossil

[allen]

can anyone tell me anything about this fossil i found?
looks like a smaller fossil of the same type is on its back..

 

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[Eager Beaver]

Looks like two shells, one bigger than the other. The small one landed on the bigger one and fossilized with it. Is the bigger one a whole shell unopened?

 

[Mosasaurfiend]

It's a pecten shell...